The word dissimulative is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 23
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (72 words)
advises, aidless, aimless, amulets, assumed, aulists, avidest, dailies, daisies, damsels, delimit, delists, demasts, demists, desalts, desilts, details, devisal, dilates, dilutes, dismals, distils, divests, divulse, dualise, dualism, dualist, duelist, elitism, estival, ileitis, ilvaite, liaised, liaises, limited, massive, medusal, medusas, mildest, militia, misdate, misdeal, misdial, misedit, mislaid, mislead, missaid, misseat, missile, missuit, misused, mueslis, saluted, salutes, sidelit, similes, stadium, stimied, stimies, stimuli, studies, suavest, sudates, taluses, tediums, tissued, tussled, utilise, uveitis, vaulted, visited, visuals